Concrete construction.



No. 825,052. PATENTED JULY 3, 1906. F. M. HENRY & J. G. MADDEN.

CONCRETE CONSTRUCTION.

APPLICATION FILED 0GT.{1.1904.

2 SHEETS-SHBET 1.

No. 825,052. PATENTED JULY 3, 1906 F. M. HENRY &-J..G. MADDEN.

CONCRETE CONSTRUCTION.

APPLICATION FILED 0014,1904.

MR 2 7H0 m .2 E w M5 r H A E. m F

formation of pipes.

onrrnn STATES PATENT clarion. x

Fit-in ers MAXWELL HENRY AND JOHN GUNN MADDEN, or MINNEAPOLIS}.

MINNESOTA.

CONCRETE CONSTRUCTION.

Specification of Letters Patent.

I'atented July 3', 1906.

Application filed October 4,1904. Serial No. 227,159.

To (tZZ YUZLONL .7725 vital/y concern:

Be it known that we, Farmers MAXWELL HENRY and Jon): GUNN MADDEN, of Minder construction until itpartially or entirely,

scts,'said. means being removable without in. any way disturbingthest-ructure built around it.

The invention'consists generally in various constructions andcombinations, all as hereinafter described, and particularly pointed outin the claims. 4

In the accompanying drawings, forming part of this specification, Figure1 is a top view of collapsible core or mold used in the Fig. 2 is avertical sectional view on the line 1 2 of Fig. 1. Fig. 3 is a verticalsectional view on the line 3 4 of F ig. l substantially at right anglesto the section line of Fig. 2. Fig. t is a detail sectional view on theline 6 of F 1. Fig. 5 is a similar view on the line 7 8 of Fig. 1. Fig.6 is a de{ tail view illustrating the joint between the sections of theshell of-the mold. Fig. 7 is a detail view showing a portion of theshell in its collapsed position, Fig. 8 is a detail view showing themeans fof' attaching the operating-arms to the mold 'shell. Fig. 9 is atop view of a modified c'bnstruction. F ig. 10 is a vertical sectionalview of the same. Fig. 11 is a detail view showing the position of oneof the wedges between the sections of the mold-shell. Fig. 1') is a topview similar to Fig. 9, showing the device collapsed. Fig. 131s verticalsectional viewol' Fig. 12. Fig. l i is a detail view showing thecollapsedposition o'fonc of the wedges. Fig. 15 a detail view showingthe manner of attaching the operating-arms to the sections of themoldshcll.

In the drawings we liavc shown the moldshell diwlded into four verticalsections, which we will designate by referenceletter A. There may be agreater or less number of these sections used, as preferred, and all ofthem forming when in use a substantially cylindrical mold-shell aroundwhich the concrete or other structure is formed.

B is a rod centrally arranged with respect to the shell, to which atintervals arms C and D are hinged at their inner ends, as at D, theouter ends of said arms being hinged *to the sections A, as at E and F.These arms have the functions of toggle links or levers, being adaptedwhen standing obliquely with respect to the rod Bto draw in the sectionsof the shell toward the center and collapsethe mold and to force thesaidsecti'ons outwardly to expand the mold-when swung to a position atright angles to th rod B, as shown in Fig. -2. Bymeahs of the slbts E inthe connections E between the arm'sC and the sections of the mold thesaid arms will have a limited initial movement without ailectingtheshell-sections '70 with which they are connected The arms D,however,having an ordinarypivotal connection with their sections willimmediately operate them as soon as the rod B is moved. Consequently theshell-sections connected 7 5 with the armsD will move ahead of theothers both when the shell is extended and collapsed, and in theoperation of the mold the shell-sections, connected, respectively, tothe arms C and D, will not. interfere with one another. We prefer toprovide slotted lugs J secured at intervals to the sections of the shelland a ring or hoop I passing through the slots in said lugs for thepurpose of'holdingthasections of the shell in their proper relative po-.85 sition, but allowing them to be moved in and out to contractorexpand the mold.-. A cover G may be provided for the niold.

The use of the slots E is not absolutely es sential. In some instancesthe difference in '0 the travel of the arms D and C will be sufiicientto produce the desired movement of the sections-L. 6., the arms (hasindicated in. Fig.2, are substantially at right angles'to the rod B, andthe arms D are obliquely arranged with respect to said rod when in theirlocked position. When, therefore, the rod B is moved lengthwise, thearms D will have a greater initial movement than the arms C, andconsequently the sections connected with the arms D will move beforethose con nected with the arms 0, and practically the sameresultistherefore obtained without the employment of the 'slots E. I

In Fig. 9 we have shown a modified construction which consists inproviding ashcll composed, preferably, of three vertical sections l1,between the joints of which a corresponding number of vertical bars M,wedgeshaped in crosssection, are arranged for the purpose of separatingor spreading the contiguous edges of the sections. Arod O is concentrically arranged with respect td the shell and is pivotallyconnected by arms P and R,

. suitable size, and there may be any suitable number of them, accordingto the characterof the structure that is being built.

An apparatus of this kind can he used in the manufacture of hollowbuilding-blocks, posts, ,&c., and in the construction of tanks,conduits, sewers, or any hollow structure of plastic material which setsor hardens after being formed around a mold.

In the operation of the modified construc tion the wedge bars engagingthe beveled contiguous edges of the shell-sections will force them apartand expand the mold to its normalworking position. .When the mold iscollapsed, the wedge bars will be withdrawn and allow the contraction ofthe shell-sec- ,tionsjand their separation from the inner surface ofthestructure formed around them.

We cla m as our 1nvention- 1. A cylindrical mold comprising a' shelldivided vertically into a series of sections, a

. rod longitudinally movable in said mold,

arms pivotally connecting said rod at intervals with the respectiveshell-sections, and

means whereby some of said sections will move before the other sectionsin expanding v and c'ollapsing the mold, substantially as de' scribed.

2. A collapsible mold comprising a shell Jdivided vertically into aseries of sections, a

v series of arms pivotally connectedto said sections, an operating-rodconnected with said armsand some of said arms having a slidingattachment with their sections, for the purpose specified. t

' collapsible cylindrical mold divided I vertically into aseries ofsections, bars wedgeshaped in cross-section provided between theg'contiguous edges of the shell-sections, arms pivotally connected tosaid shell-sections and to ,said .bars respectively, an operating-reivotally attached to the inner ends of said ars, ,and' meanswherelo'ysaidmold-sections will remain stationary'during a'predeterminednitial movement of" said. wedge bars in both directions, substantiallyas described.

4. A collapsible mold comprising a shell 2 divided vertically intoindependent sections, vertical bars wedge-shaped in cross-sectionprovided between the contiguous edges of i said sections, anoperating-rod, arms pivotl ally connecting said rod with said shell-sec-I ing slotted lugs, and a hoop passing through able inand out tocontract or expand the mold, substantially as described.

6. A mold comprising a shell divided longitudinally into a series ofsections, a rod longitudinally movable in said mold, arms piv- 'otallyconnecting said rodat intervals with the respective shell-sections andsome of said than the angles formed by other arms and said rod, for thepurpose specified,

of sections, bars wedge-shaped in cross-section, provided betweencontiguous edges of the shell-sections, arms pivotally connected to saidshell-sections and to said bars respectively, an operating-rod pivotallyattached to the inner ends of said bars the arms connecting said rodwith said shell-sections being substantially at right angles to saidrod, and the arms connecting said rod and said bars being obliquelyarranged with respect to saidrod when the mold is in its expandedposition, substantially as described.

8. A iIlOld divided longitudinally into a series of sections, barsWedge-shaped in crosssection provided between the contiguous edges ofthe shell-sections, arms pivotally connected to said shell-sections andto said bars respectively, an operating-rod pivotally at tached to theinner ends ofsaid bars, and means whereby said mold-sections will remainstationary during a predetermined initial movement of said Wedge bars inboth directions, substantially as described. ln testimony whereof wehave signed our names to this specification, in the presence of twosubscribing witnesses, October 1, 1904.

FRANCIS MAXWELL HENRY.

JOHN GUNN MADDEN. Witnesses:

WILLIAM STUART JAMIESON, ELLA BREWER.

divided vertically into a series of sections, an-

sections having a series of inwardly-projectsaid lugs and whereon saidsections are slid arms. forming greater angles with said rod 7 Acylindrical mold divided into a series

